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UC2848DWTR

更新时间： 2024-09-29 19:20:27
品牌 Logo 应用领域
德州仪器 - TI 开关光电二极管
页数 文件大小 规格书
17页 997K
描述
2.2A SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO16

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中文翻译

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UC2848DWTR 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：SOP, SOP16,.4针数：16
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.82
模拟集成电路 - 其他类型：SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：20 V
最小输入电压：11 V标称输入电压：12 V
JESD-30 代码：R-PDSO-G16长度：10.3 mm
功能数量：1端子数量：16
最高工作温度：85 °C最低工作温度：-40 °C
最大输出电流：2.2 A封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP16,.4
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：NOT SPECIFIED认证状态：Not Qualified
座面最大高度：2.65 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：SINGLE
最大切换频率：1000 kHz技术：BIPOLAR
温度等级：INDUSTRIAL端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：7.5 mm
Base Number Matches：1

UC2848DWTR 数据手册

 浏览型号UC2848DWTR的Datasheet PDF文件第2页浏览型号UC2848DWTR的Datasheet PDF文件第3页浏览型号UC2848DWTR的Datasheet PDF文件第4页浏览型号UC2848DWTR的Datasheet PDF文件第5页浏览型号UC2848DWTR的Datasheet PDF文件第6页浏览型号UC2848DWTR的Datasheet PDF文件第7页 
application  
INFO  
UC1848  
UC2848  
UC3848  
available  
Average Current Mode PWM Controller  
BLOCK DIAGRAM  
FEATURES  
• Practical Primary Side Control of  
Isolated Power Supplies with DC  
Control of Secondary Side Current  
• Accurate Programmable Maximum  
Duty Cycle Clamp  
• Maximum Volt-Second Product Clamp  
to Prevent Core Saturation  
• Practical Operation Up to 1MHz  
• High Current (2A Pk) Totem Pole  
Output Driver  
• Wide Bandwidth (8MHz) Current Error  
Amplifier  
• Under Voltage Lockout Monitors VCC,  
VIN and VREF  
• Output Active Low During UVLO  
• Low Startup Current (500µA)  
• Precision 5V Reference (1%)  
UDG-93003-1  
DESCRIPTION  
The UC3848 family of PWM control ICs makes primary output driver. The current error amplifier easily interfaces  
side average current mode control practical for isolated with an optoisolator from a secondary side voltage sens-  
switching converters. Average current mode control in- ing circuit.  
sures that both cycle by cycle peak switch current and  
A full featured undervoltage lockout (UVLO) circuit is con-  
maximum average inductor current are well defined and  
tained in the UC3848. UVLO monitors the supply voltage  
will not run away in a short circuit situation. The UC3848  
to the controller (VCC), the reference voltage (VREF),  
can be used to control a wide variety of converter topolo-  
and the input line voltage (VIN). All three must be good  
before soft start commences. If either VCC or VIN is low,  
gies.  
In addition to the basic functions required for pulse width  
modulation, the UC3848 implements a patented tech-  
nique of sensing secondary current in an isolated buck  
derived converter from the primary side. A current wave-  
form synthesizer monitors switch current and simulates  
the inductor current down slope so that the complete cur-  
rent waveform can be constructed on the primary side  
without actual secondary side measurement. This infor-  
mation on the primary side allows for full DC control of  
output current.  
the supply current required by the chip is only 500µA and  
the output is actively held low.  
Two on board protection features set controlled limits to  
prevent transformer core saturation. Input voltage is mon-  
itored and pulse width is constrained to limit the maxi-  
mum volt-second product applied to the transformer. A  
unique patented technique limits maximum duty cycle  
within 3% of a user programmed value.  
These two features allow for more optimal use of trans-  
formers and switches, resulting in reduced system size  
and cost.  
The UC3848 circuitry includes a precision reference, a  
wide bandwidth error amplifier for average current con-  
trol, an oscillator to generate the system clock, latching  
PWM comparator and logic circuits, and a high current  
Patents embodied in the UC3848 belong to Lambda  
Electronics Incorporated and are licensed for use in ap-  
plications employing these devices.  
SLUS225A - April 1996 - REVISED MARCH 2004  
1234567...17

中文翻译

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UC2848QTR TI

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 		Secondary Side Average Current Mode Controller
UC2849DW ROCHESTER

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UC2849DWG4 ROCHESTER

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UC2849DWTR ROCHESTER

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 		0.3A SWITCHING CONTROLLER, 550kHz SWITCHING FREQ-MAX, PDSO24, GREEN, PLASTIC, SOIC-24

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